CBS News transportation correspondent Kris Van Cleave reported that a Department of Homeland Security official said a router went off-line which required a "manual process of vetting against the (secure flight) watch list."

"U.S. Customs and Border Protection experienced a temporary outage with its processing systems at air ports of entry in the United States and took immediate action to address the technology disruption," the agency said in a statement late Wednesday. "In the meantime, CBP officers processed international travelers using alternative procedures until systems were back on line."

The statement said the outage lasted about 90 minutes.

"At this time, there is no indication the service disruption was malicious in nature," Customs and Border Protection said.

The DHS official said John F. Kennedy International Airport in New York was likely the most significantly impacted but that other airports also experienced disruptions.

No flights at Milwaukee's General Mitchell Airport appeared to be directly impacted by the glitch.